From e9bfa1396ff47d171b3052a606e0931e6f93cc9c Mon Sep 17 00:00:00 2001
From: houzhongjian <houzhongyi@126.com>
Date: 星期四, 10 四月 2025 12:05:23 +0800
Subject: [PATCH] 还原framework代码
---
iailab-framework/iailab-common-excel/src/main/java/com/iailab/framework/excel/core/util/ExcelUtils.java | 66 +++++++++++++++++++++++++++++++++
1 files changed, 66 insertions(+), 0 deletions(-)
diff --git a/iailab-framework/iailab-common-excel/src/main/java/com/iailab/framework/excel/core/util/ExcelUtils.java b/iailab-framework/iailab-common-excel/src/main/java/com/iailab/framework/excel/core/util/ExcelUtils.java
new file mode 100644
index 0000000..f16434e
--- /dev/null
+++ b/iailab-framework/iailab-common-excel/src/main/java/com/iailab/framework/excel/core/util/ExcelUtils.java
@@ -0,0 +1,66 @@
+package com.iailab.framework.excel.core.util;
+
+import com.iailab.framework.excel.core.handler.SelectSheetWriteHandler;
+import com.alibaba.excel.EasyExcel;
+import com.alibaba.excel.converters.longconverter.LongStringConverter;
+import com.alibaba.excel.write.style.column.LongestMatchColumnWidthStyleStrategy;
+import org.springframework.web.multipart.MultipartFile;
+
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+
+/**
+ * Excel 工具类
+ *
+ * @author iailab
+ */
+public class ExcelUtils {
+
+ /**
+ * 将列表以 Excel 响应给前端
+ *
+ * @param response 响应
+ * @param filename 文件名
+ * @param sheetName Excel sheet 名
+ * @param head Excel head 头
+ * @param data 数据列表哦
+ * @param <T> 泛型，保证 head 和 data 类型的一致性
+ * @throws IOException 写入失败的情况
+ */
+ public static <T> void write(HttpServletResponse response, String filename, String sheetName,
+ Class<T> head, List<T> data) throws IOException {
+ // 输出 Excel
+ EasyExcel.write(response.getOutputStream(), head)
+ .autoCloseStream(false) // 不要自动关闭，交给 Servlet 自己处理
+ .registerWriteHandler(new LongestMatchColumnWidthStyleStrategy()) // 基于 column 长度，自动适配。最大 255 宽度
+ .registerWriteHandler(new SelectSheetWriteHandler(head,false)) // 基于固定 sheet 实现下拉框
+ .registerConverter(new LongStringConverter()) // 避免 Long 类型丢失精度
+ .sheet(sheetName).doWrite(data);
+ // 设置 header 和 contentType。写在最后的原因是，避免报错时，响应 contentType 已经被修改了
+ response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, StandardCharsets.UTF_8.name()));
+ response.setContentType("application/vnd.ms-excel;charset=UTF-8");
+ }
+
+ public static <T> List<T> read(MultipartFile file, Class<T> head) throws IOException {
+ return EasyExcel.read(file.getInputStream(), head, null)
+ .autoCloseStream(false) // 不要自动关闭，交给 Servlet 自己处理
+ .doReadAllSync();
+ }
+
+ public static <T> void write(HttpServletResponse response, String filename, String sheetName,
+ Class<T> head, List<T> data, boolean selectFlag) throws IOException {
+ // 输出 Excel
+ EasyExcel.write(response.getOutputStream(), head)
+ .autoCloseStream(false) // 不要自动关闭，交给 Servlet 自己处理
+ .registerWriteHandler(new LongestMatchColumnWidthStyleStrategy()) // 基于 column 长度，自动适配。最大 255 宽度
+ .registerWriteHandler(new SelectSheetWriteHandler(head,selectFlag)) // 基于固定 sheet 实现下拉框
+ .registerConverter(new LongStringConverter()) // 避免 Long 类型丢失精度
+ .sheet(sheetName).doWrite(data);
+ // 设置 header 和 contentType。写在最后的原因是，避免报错时，响应 contentType 已经被修改了
+ response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, StandardCharsets.UTF_8.name()));
+ response.setContentType("application/vnd.ms-excel;charset=UTF-8");
+ }
+}
--
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